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Ensure All GameObjects Are Visible Within Camera Frame

Discussion in 'Scripting' started by gretty, Aug 10, 2014.

  1. gretty

    gretty

    Joined:
    Jun 20, 2012
    Posts:
    72
    Hello

    How do you make a camera position itself so all GameObjects are in frame?

    For example; I have many GameObjects that represent pipes, pits, roads, etc. and they all sit on a Terrain. I want to make my camera sit with a birds eye view (look straight down) and show all these GameObjects.

    But the most important thing is that all GameObjects are visible within the camera frame.

    Any ideas how I can do this?

    A very inefficient way could be:
    - Position the camera at (0, 1, 0) and rotate it so its looking straight down
    - Move the camera up on the Y axis
    - Make each GameObject listen to the OnBecameVisible() method. When all GameObjects have received a OnBecameVisible() event I know all GameObjects are visible and should stop moving the camera up on the Y axis.


    But thats a little hacky, any other ideas how I can do this?
     
  2. Fraconte

    Fraconte

    Joined:
    Dec 6, 2013
    Posts:
    327
    If you can find the 4 extreme positions to visualize (top,left, bottom, right) then you can check with camera.WorldToScreenPoint (target.position) if they are in the view rect.
     
  3. Fraconte

    Fraconte

    Joined:
    Dec 6, 2013
    Posts:
    327
    Perhaps you can use this to position the camera if you know at least the height of the frustum:

    Code (CSharp):
    1.  
    2. float DistanceForHeightAndFov(float height, float fov)
    3. {
    4.     return height * 0.5f / Mathf.Tan(fov * 0.5f * Mathf.Deg2Rad);
    5. }
    6.  
     
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